Patent GB-190225744-A (GB)
Title: Improvements in Steam Pipe Ovens.
Filed: 1902-11-22
Granted: 1903-10-22
Abstract: 25,744. Beanes, W. H., and Werner, Pfleiderer, & Perkins. Nov. 22, Oven furnaces; liquid and gaseous fuel fittings.- Relates to baking and other ovens heated by means of steam pipes which pass in an inclined direction from the oven to a combustion chamber, where they are heated by the combustion of solid, gaseous, or liquid fuel. The two ovens a, Figs. 1 and 2, arranged one above the other, are each provided with lower and upper groups of steam pipes b, b<1>, the lower ends of which extend into the enlarged lower and upper end portions c, c<1> of a combustion chamber extending across the end of the oven. An air and gas tuyÞre or burner d extending across the full width of the lower portion c of the chamber, has air and gas passages e, f arranged one above the other and connected to supply pipes g, h. The air issues through horizontal slots k of decreasing cross-section in the front of the chamber e, which direct it downwards so as to impinge on the ascending gas issuing from similar slots m in the chamber f, the slots m being set a slight distance forward of the slots k. The upwardlyinclined bottom wall n of the tuyÞre is formed with a perforated front portion o, through which the pipes b pass, and with an upwardly-inclined flanged portion p, serving as a deflector to the flame and gases passing between the ends of the pipes. An air tuyÞre q in the upper portion c<1> of the combustion chamber comprises an air chamber r, connected at its ends to supply pipes s and having an inclined front wall with openings t, and a channel u into which the hot gases, after passing between the ends of the pipes b<1>, escape on their way to a flue v passing over the top of the oven to a chimney. The inclined roof-plate of the combustion chamber serves to deflect the flames and gases into the channel u, and, in the case of the lower oven, is formed by the plate n of the upper tuyere d, while for the upper oven a separate inclined plate w is arranged above the tuyÞre q. The tuyÞres d, q are provided with doors x to facilitate cleaning. The hot gases, after heating the ends of the pipes b, pass up through the contracted portion c<2> of the combustion chamber into the upper portion c<1>, where they heat the ends of the pipes b<1> and meet air supplied by the tuyÞre q to complete the combustion. The gases, as they escape through the flue v, heat pipes g, s supplying air to the tuyÞres. In a modification, the pipes b, Fig. 3, pass into a combustion chamber c supplied with air and gas by separate tuyÞres e<1>, f<1>. The chamber c is so constructed, and the ends of the pipes b are so disposed, as to practically form the roof of the chamber, the wall 1 forming the upper boundary of the chamber being in contact with the tops of the pipes so as to compel the flames and hot gases to travel along the pipes until they escape to the chimney, or the next series of pipes above, either by way of the contracted portion c' of the chamber, or by a more circuitous course c<3>. The tuyeres e<1>, f <1> are accessible through doors 3, which may have windows through which the flames are visible, and are each provided with a seating of asbestos &c. The air for combustion is heated as it passes through ducts, either in the flue v or in a regenerative chamber 5 fixed over the top of the combustion chamber, or, as shown, through ducts g extending through both the flue v and chamber 5. Fig. 5 shows an arrangement of ovens with combustion chambers c adapted to burn solid fuel. The steam pipes b pass into the chamber c, and the fuel is burnt upon the bottom row of tubes or upon fire bars arranged beneath the tubes. The flames and hot gases pass up between the upper steam pipes b<1>, and are deflected by the inclined roof 6 into a channel u leading to a chimney.